To reproduce problem, load demo.zul and select and item, then click on "Change entries!" and you will see the exception.If you reload the page, then just click "Change entries!" without doing a selection first, then it works as expected (2 new items in combobox instead of original data)

Hi Tisaksen,Please go to the CLick Here and try Download and run the application.It will Work fine But When you will copy-paste same Code in Your Application it will not work .May this is a Jar Issue Please update jars your code Definitely work.I Did lots of POC on your code and other codes.If you have any concern please let me knowThanks

sjoshi, thank you very much for your help. It was a jar issue indeed! I had just upgraded from 5.x to 6.0.2 when I discovered the error. Now I have cleaned up jar files and everything is working just fine :-) Joy!

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